Clean out the fridge! I hate coming home and realizing there is stinky leftover Chinese food from before we went on vacation.
Triple check all the window and doors and set the alarm system.
Adjust the thermostat - well, in the summer, I make sure it's off so there is no chance of the A/C kicking on while we are gone.
Transfer the laundry - not fun to come home to clothes that have been sitting in the washer - and on that note, make sure the washer door is open (front-loader).
Turn off all ceiling fans and lights, except for a light up in the master bath and one in the downstairs hallway or kitchen so it looks like someone might be home. Like you mentioned, we unplug everything, including computers and TV power strips. Make sure the motion sensor lights outside are on.
One thing we sometimes do is haul our trash and recycling bins to the road so we don't miss the trash day while we are gone, thus, stinking up the garage; however, that means they are out there all week, unless you have someone to bring them back up. It's really windy where we are, so the bins can go pretty far down the road, plus it might look like we are out of town.
That's all I can think of. Oh, would you need to stop your mail so it doesn't accumulate? We have locked mailboxes that hold plenty down the road, so I don't worry about this.